Add-on device with configurable optics for an image scanner for scanning barcodes

ABSTRACT

An add-on device for an image scanner for scanning barcodes is provided. The add-on device includes a housing mounted to the standard range lens front on an image scanner, and a lens holder. The lens holder has a first position for holding a first lens, a second position being an aperture, and a third position for holding a second lens. A high-density lens is mounted in the first position. An extended range lens is mounted in the third position. The lens holder is mounted in the housing and is transverse to the optical axis of the standard range lens of the image scanner. Further, the lens holder is movable within the housing in order to alternately position the high-density lens, the aperture, and the extended range lens to be in alignment with the optical axis of the standard range lens of the image scanner.

FIELD OF THE INVENTION

The present invention relates image scanners for scanning barcodes, andin particular to an add-on device with configurable optics for variousdecoding applications.

BACKGROUND

Generally speaking, currently there are imaging scanner products ofthree types. Each is specific to a range application and is defined bythe lens used in the imaging scanner.

For example, for general-purpose applications an imaging scanner uses astandard range (SR) lens. A high-density lens (HD) with focus at a nearrange is used for the best performance in the near range to read finepitch high-density codes. Extended range (ER) lenses with longer focallengths and a narrower field of view are used when there is a need toextend the working range of the imaging scanner.

In each case, a different scanner is required. In some applications,different types of barcodes need to be read within the same work area,resulting in the need for multiple scanners at one location.

Therefore, a need exists for a unified scanner with multi-field of viewand multi-focus capability, while using the minimum components at thelowest cost.

SUMMARY

Accordingly, in one aspect, the present invention embraces an add-ondevice for an image scanner for scanning barcodes. The image scanner isprovided with a standard range lens, having a lens front and an opticalaxis.

In an exemplary embodiment, an add-on device for the image scanner forscanning barcodes includes a housing, and a lens holder. The housing ismounted to the standard range lens front on the image scanner. The lensholder is provided with a first position for holding a first lens,second position with an aperture, and a third position for holding asecond lens. A high-density lens is mounted in the first position. Anextended range lens mounted in the third position. The lens holder ismounted in the housing and transverse to the optical axis of the imagescanner. Further, the lens holder is movable within the housing toalternately position the high-density lens, the aperture, and theextended range lens to be in alignment with the optical axis of thestandard range lens of the image scanner.

In another exemplary embodiment, the add-on device is further providedwith a motor mounted to the housing. The motor is coupled to the lensholder. The motor is configured to move the lens holder within thehousing to alternately position the high-density lens, the aperture, andthe extended range lens to be in alignment with the optical axis of thestandard range lens of the image scanner.

In another exemplary embodiment of the add-on device, the motor isprovided with a threaded shaft. The lens holder is provided with athreaded receiver. The motor is coupled to the lens holder via thethreaded shaft being received into the threaded receiver.

In yet another exemplary embodiment of the add-on device, the lensholder is rotatably movable in the housing.

In another exemplary embodiment of the add-on device, the lens holder ismovable within the housing in a direction parallel to a surface on whichthe image scanner is disposed.

In another exemplary embodiment of the add-on device, the lens holder ismovable within the housing in a direction perpendicular to a surface onwhich the image scanner is disposed.

In another exemplary embodiment of the add-on device, the extended rangelens is a telescopic doublet lens.

In another exemplary embodiment of the add-on device, the high-densitylens is a plano-convex lens.

In yet another exemplary embodiment of the add-on device, the extendedrange lens and the high-density lens are molded into the lens holder.

In another exemplary embodiment of the add-on device, the housing isprovided with a sliding pin. The lens holder is provided with a receiverfor the sliding pin. The lens holder is movably mounted to the housingwhen the sliding pin is received in the receiver.

In another exemplary embodiment of the add-on device, the first, secondand third positions being in alignment with the optical axis of thestandard range lens of the image scanner are predetermined positions.The lens holder is provided with mechanical stops for the predeterminedpositions within the housing.

In another exemplary embodiment of the add-on device, the motor is amicro dc motor.

In another exemplary embodiment of the add-on device, the motor isprovided with a self-locking thread drive mechanism.

In another exemplary embodiment, the image scanner is provided with alaser aimer and an illuminator. The laser aimer, the illuminator, andthe standard range lens are in a first linear relationship. The add-ondevice further includes an aimer lens. The lens holder is provided withan aimer lens holder. The aimer lens is disposed in the aimer lensholder. The aimer lens holder is in a second linear relationship withthe third position. The first position, the second position, and thethird position being in a third linear relationship. The second linearrelationship is perpendicular to the third linear relationship. Thesecond linear relationship corresponds to the first linear relationship,such that when the third position is in alignment with the optical axisof the image scanner, the aimer lens is in alignment with the laseraimer.

In another exemplary embodiment, the add-on device further includes anilluminator lens. The lens holder is provided with an illuminator lensholder. The illuminator lens is disposed in the illuminator lens holder.The illuminator lens holder is in the second linear relationship withthe third position and the aimer lens holder. The second linearrelationship corresponds to the first linear relationship such that whenthe third position is in alignment with the optical axis of the imagescanner, the aimer lens is in alignment with the laser aimer, and theilluminator lens is in alignment with the illuminator.

In yet another exemplary embodiment of the add-on device, the firstposition is provided to hold more than one lens, and the high-densitylens is comprised of more than one lens.

In another exemplary embodiment of the add-on device, the third positionis provided to hold more than one lens, and the extended range lenscomprised of more than one lens.

In another exemplary embodiment of the add-on device, the firstposition, the second position, and the third position are adapted toadditionally hold at least one filter.

In another exemplary embodiment of the add-on device, the at least onefilter is selected from ultraviolet light filters, near infraredfilters, polarization filters, filters with combinations of optimizedspectrum and polarization.

In another exemplary embodiment of the add-on device, the extended rangelens is selected from and a liquid lens, a liquid crystal lens, and atelescopic doublet lens.

The foregoing illustrative summary, as well as other exemplaryobjectives and/or advantages of the invention, and the manner in whichthe same are accomplished, are further explained within the followingdetailed description and its accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 schematically depicts an image scanner generally of one of thetype, which can be used with the invention.

FIG. 2 schematically depicts an exemplary embodiment of the inventionwith a horizontally movable lens holder in the first position.

FIG. 3 schematically depicts another position of the exemplaryembodiment of FIG. 2 with the horizontally movable lens holder in thesecond position.

FIG. 4 schematically depicts another position of the exemplaryembodiment of FIG. 2 with the horizontally movable lens holder in thethird position.

FIG. 5 schematically depicts another exemplary embodiment of theinvention with a vertically movable lens holder in the first positionand optional attachments.

FIG. 6 schematically depicts another position of the exemplaryembodiment of FIG. 5 the vertically movable lens holder in the secondposition.

FIG. 7 schematically depicts another position of the exemplaryembodiment of FIG. 5 with the vertically movable lens holder in thethird position.

FIG. 8 schematically depicts in an expanded view another exemplaryembodiment of the invention having a rotatably movable lens holder.

DETAILED DESCRIPTION

The present invention embraces an add-on device for an image scanner forscanning barcodes. Referring to FIG. 1, a typical image scanner (10) foruse with the present invention, is provided with a standard range lens(11), with a lens front (12), and an optical axis (13), depicted by thearrow extending from the standard range lens (11). The image scanner(10) may also be provided with a laser aimer (14) and an illuminator(15). In the foregoing figures, an image scanner (10) as depicted inFIG. 1 is used as the basis of the add-on device, although other imagescanner configurations are possible.

An exemplary embodiment of the add-on device for the image scanner isdepicted in FIGS. 2-4. The add-on device (20) includes a housing (22).The housing (22) is mounted to the standard range lens front (not shownin this figure) on the image scanner (10). The add-on device (20)further includes a lens holder (24) with a first position (25) forholding a first lens, second position (26) with an aperture, and a thirdposition (27) for holding a second lens. A high-density lens (28) ismounted in the first position (25). An extended range lens (29) ismounted in the third position (27). The lens holder (24) is mounted inthe housing (22) transverse to the optical axis (23) of the imagescanner (10). The lens holder (24) is movable within the housing (22) toalternately position the high density lens (28), the aperture (26), andthe extended range lens (29) to be in alignment with the optical axis(13), depicted hereinafter by the crosshairs over the lens position, ofthe standard range lens (11) of the image scanner (10). In the presentFIG. 2, the high-density lens (28) is positioned and aligned withoptical axis (13) of the standard range lens (11). FIG. 3 depicts thesecond position (26) with the aperture aligned with the optical axis(13) of the standard range lens (11). FIG. 4 depicts the extended rangelens (29) aligned with the optical axis (13) of the standard range lens(11).

In another exemplary embodiment, also depicted in FIGS. 2-4, the add-ondevice (20) is provided with a motor (31) mounted to the housing (22).The motor (31), for example may be a micro dc motor. The motor (31) canalternately position the high-density lens (28), the aperture (26), andthe extended range lens (29) in alignment with the optical axis (13) ofthe standard range lens (11) as depicted in FIGS. 2, 3, and 4respectively.

In another exemplary embodiment, the motor (31) is provided with athreaded shaft (32), and the housing (22) is provided with a threadedreceiver (33). In this way, the motor (31) can alternately align thepositions with the optical axis (13) of the standard lens (11).Preferably, the motor (31) is provided with a self-locking threadmechanism, which allows the position of the lens holder (24) to be heldaccurately while the image scanner (10) is in use.

Further, the housing (22) may be provided with a sliding pin (34) whichis received in a receiver (35) on the lens holder (24). The sliding pinassists in moving the lens holder (24) and helps keep the lens holder(24) in alignment with respect to the optical axis (13) of the standardrange lens (11).

In the embodiments depicted in FIGS. 2-4, the lens holder (24) ismovable within the housing (22) in a horizontal direction, that is, in adirection parallel to a surface (not shown) on which the image scanner(10) may be disposed.

FIGS. 5, 6, and 7 depict another exemplary embodiment of the add-ondevice (20) of the present invention where the lens holder (24) ismovable within the housing (22) in a direction perpendicular to asurface on which the image scanner (10) may be disposed. The embodimentsof FIGS. 5-7 generally have all the same features as described inconnection with FIGS. 2-4. FIG. 5, which is a perspective view of theimage scanner and add-on device, shows the high-density lens (28) inalignment with the optical axis (not shown in this figure) of thestandard range lens, (not visible in the present figure.) FIG. 6, whichdepicts another view of the image scanner and add-on device of theinvention, shows the aperture (26) in alignment with the optical axis(13) of the standard range lens (11) of the image scanner (10). FIG. 7,is similar in perspective to FIG. 6, but depicts the extended range lens(29) in alignment with the optical axis (13) of the standard range lens(11) of the image scanner (10).

In another exemplary embodiment as shown in FIGS. 5-7, the add-on device(20) is provided with an aimer lens (39) mounted in the lens holder (24)via an aimer lens holder (40). As shown particularly in FIG. 7, onlywhen the extended range lens (29) is in alignment with the optical axis(13) of the standard range lens (11), is the aimer lens (39) positionedin front of the aimer (14) of the image scanner (10).

In another exemplary embodiment depicted in FIGS. 5-7, optionally, inaddition to the aimer lens (39), the add-on device (20) may be providedwith an illuminator lens (41) which is mounted in the lens holder (24)via an illuminator lens holder (42). As with the aimer lens (39), theilluminator lens (41) is only aligned with the illuminator (15) when theextended range lens (29) is in alignment with the optical axis (13) ofthe standard range lens (11).

The aimer lens (39), the illuminator lens (41), and the extended rangelens (29) are generally in line with each other, forming a lineararrangement, which corresponds to the linear arrangement of the standardrange lens (11), the aimer (14) and the illuminator (15).

In another exemplary embodiment, depicted in FIG. 8, the add-on device(20) is rotatably movable. As shown in the figure, the add-on device(20) has a housing (22) and a lens holder (24). A motor (31) withthreaded shaft (32) is mounted on the housing (22) and moves the lensholder (24) rotatably. The housing (22) has an opening (21) whichcorresponds to the standard range lens on an image scanner. The imagescanner not being shown in the present figure. The lens holder (24) ismounted to the housing (22) via a mounting pin (50). The lens holder(24) has positions to hold a high-density lens (28), and extended rangelens (29) and an aperture (26). The motor shaft (32) is coupled to thelens holder (24) such that the lens can be rotated in front of theopening (21) in the housing and thus be aligned with the optical axis ofthe standard range lens on an image scanner.

The lens holder (24) is preferably provided with a motion limiter (23)which may also function as a mechanical stop.

In any of the forgoing embodiments in FIGS. 1-8, the positions of thelens and aperture being in alignment with the optical axis of thestandard range lens may be considered predetermined positions. The lensholder in any of the foregoing embodiments may be provided withmechanical stops for these predetermined positions. While not depictedin FIGS. 2-7, the motion limiter (23) in FIG. 8, may function as amechanical stop and the lens holder (24) may be provided with one ormore mechanical stops.

FIG. 8 further depicts an additional extended range lens (43) to be heldin the lens holder (24). In any of the foregoing embodiments depicted inFIGS. 2-8, the lens holder positions may be adapted to hold more thanone lens, or other optical components such as ultraviolet light filters,near infrared filters, polarization filers, and filters withcombinations of optimized spectrum and polarization.

Additionally, in any of the foregoing embodiments, the high-density lensis preferably a plano-convex lens, but may be comprised of more than onelens. The high-density lens may be molded into the lens holder.

Further, in any of the foregoing embodiments, the extended range lens ispreferably a telescopic doublet lens. Additionally, the extended rangelens may be a liquid lens, a liquid crystal lens, or a telescopicdoublet lens. The extended range lens may be molded into the lensholder.

To supplement the present disclosure, this application incorporatesentirely by reference the following commonly assigned patents, patentapplication publications, and patent applications:

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In the specification and/or figures, typical embodiments of theinvention have been disclosed. The present invention is not limited tosuch exemplary embodiments. The use of the term “and/or” includes anyand all combinations of one or more of the associated listed items. Thefigures are schematic representations and so are not necessarily drawnto scale. Unless otherwise noted, specific terms have been used in ageneric and descriptive sense and not for purposes of limitation.

The invention claimed is:
 1. An add-on device for an image scanner forscanning barcodes, the image scanner having a scanner lens, the scannerlens having a lens front and an optical axis; the add-on devicecomprising: a housing, the housing mounted to the scanner lens front onthe image scanner; a lens holder with a first position for holding afirst lens, a second position being an aperture, and a third positionfor holding a second lens; a high-density lens mounted in the firstposition; an extended range lens mounted in the third position; the lensholder being mounted in the housing and being transverse to the opticalaxis of the image scanner; the lens holder being movable within thehousing to alternately position the high-density lens, the aperture, andthe extended range lens to be in alignment with the optical axis of thescanner lens of the image scanner.
 2. The add-on device of claim 1,further comprising a motor mounted to the housing; the motor beingcoupled to the lens holder; the motor being configured to move the lensholder within the housing to alternately position the high density lens,the aperture, and the extended range lens to be in alignment with theoptical axis of the scanner lens of the image scanner.
 3. The add-ondevice of claim 2, wherein the motor is provided with a threaded shaft;the lens holder is provided with a threaded receiver; and wherein themotor is coupled to the lens holder via the threaded shaft beingreceived into the threaded receiver.
 4. The add-on device of claim 3,wherein the motor is provided with a self-locking thread drivemechanism.
 5. The add-on device of claim 2, wherein the lens holder isrotatably movable in the housing.
 6. The add-on device of claim 2,wherein the lens holder is movable within the housing in a directionparallel to a surface on which the image scanner is disposed.
 7. Theadd-on device of claim 2, wherein the lens holder is movable within thehousing in a direction perpendicular to a surface on which the imagescanner is disposed.
 8. The add-on device of claim 2, wherein the motoris a micro dc motor.
 9. The add-on device of claim 1, wherein theextended range lens is a telescopic doublet lens.
 10. The add-on deviceof claim 1, wherein the high-density lens is a plano-convex lens. 11.The add-on device of claim 1, wherein the extended range lens and thehigh-density lens are molded into the lens holder.
 12. The add-on deviceof claim 1, wherein the housing is provided with a sliding pin; andwherein the lens holder is provided with a receiver for the sliding pin;the lens holder being movably mounted to the housing when the slidingpin is received in the receiver.
 13. The add-on device of claim 1,wherein the first, second and third positions being in alignment withthe optical axis of the scanner lens of the image scanner arepredetermined positions; and wherein the lens holder is provided withmechanical stops for the predetermined positions within the housing. 14.The add-on device of claim 1, wherein the image scanner is provided witha laser aimer and an illuminator; the laser aimer, the illuminator andthe scanner lens being in a first linear relationship; the add-on devicefurther comprising an aimer lens; the lens holder being provided with anaimer lens holder; the aimer lens being disposed in the aimer lensholder; the aimer lens holder being in a second linear relationship withthe third position; the first position, the second position and thethird position being in a third linear relationship; the second linearrelationship being perpendicular to the third linear relationship; thesecond linear relationship corresponding to the first linearrelationship, such that when the third position is in alignment with theoptical axis of the image scanner, the aimer lens is in alignment withthe laser aimer.
 15. The add-on device of claim 14, wherein the add-ondevice further comprises an illuminator lens; the lens holder beingprovided with an illuminator lens holder; the illuminator lens beingdisposed in the illuminator lens holder; the illuminator lens holderbeing in the second linear relationship with the third position and theaimer lens holder; the second linear relationship corresponding to thefirst linear relationship such that when the third position is inalignment with the optical axis of the image scanner, the aimer lens isin alignment with the laser aimer and the illuminator lens is inalignment with the illuminator.
 16. The add-on device of claim 1,wherein the first position is provided to hold more than one lens; andwherein the high-density lens is comprised of more than one lens. 17.The add-on device of claim 1, wherein the third position is provided tohold more than one lens; and wherein the extended range lens comprisedof more than one lens.
 18. The add-on device of claim 1, wherein thefirst position, the second position, and the third position are adaptedto additionally hold at least one filter.
 19. The add-on device of claim18, wherein the at least one filter is selected from ultraviolet lightfilters, near infrared filters, polarization filters, filters withcombinations of optimized spectrum and polarization.
 20. The add-ondevice of claim 1, wherein the extended range lens is selected from anda liquid lens, a liquid crystal lens, and a telescopic doublet lens.